第8题: [单项选择]{{B}}Passage One
Questions 26 to 28 are based on the passage you have just heard.{{/B}} A. Rats can populate rapidly. B. Population explosion can lead to violence. C. Overcrowdedness may have the same effects on man. D. It is a natural law that animals live and die. 参考答案:C 答案解析:[听力原文]
What is the experiment done on rats intended to prove
[解析] 题目询问对老鼠的实验是为了证明什么。关键是最后一句“